A polyarylene sulfide resin composition includes: (A) a polyarylene sulfide resin having a carboxyl group content of more than 100 μmol/g and less than 400 μmol/g, and also having a weight average molecular weight of 10,000 or more and less than 100,000; and (B) a filler. The polyarylene sulfide resin composition has improved mechanical properties and chemical resistance while maintaining intrinsic high melting point of a polyarylene sulfide.